You might want to consider a "coax coil" exchanger. It's nowhere as compact but the bigger internal volume makes it a lot easier to get the charge right. If possible, get one with about twice the capacity of the compressor (more than that is OK but well into diminishing returns) for the best efficiency.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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